Runespoor fang

"It's two Sickles a scoop, people, so stop being cheap, stop throwing powdered Runespoor fangs on the fire and stop blowing yourselves out of the chimney! If one more wizard comes in here with a burned backside, I swear I won’t treat him. It’s two Sickles a scoop!"

The fang of the Runespoor was employed by witches and wizards for magical purposes. Powdered Runespoor fangs were apparently used to make one type of "Faux Floo," or homemade powders that some witches and wizards tried unsuccessfully to use as a substitute for Floo Powder, often leading to injuries.[1]